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Pyrogenic process zinc smelting system

A technology of zinc smelting and pyrotechnics, applied in the field of pyrometallic zinc smelting, which can solve the problems of complex process, high energy consumption, low zinc recovery rate, etc., and achieve high recovery rate, large amount of stored melt, and high production rate Effect

Pending Publication Date: 2019-08-16
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a pyro-method zinc smelting system to solve the existing problems in the pyro-method zinc smelting system such as complex process, high energy consumption, and low zinc recovery rate.

Method used

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  • Pyrogenic process zinc smelting system
  • Pyrogenic process zinc smelting system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Zinc concentrate (containing Zn: 50%) and slagging agents (FeO, SiO 2 and CaO) are directly added from the feeding port set in the smelting area of ​​the Bref furnace, and the oxygen-enriched air is sprayed into the Bref furnace from the side of the smelting area of ​​the Bref furnace, and then the zinc concentrate and the oxygen-enriched air are oxidized and smelted to obtain flue gas, high zinc scum. Flue gas SO in smelting zone of Bref furnace 2 The content is more than 20%. After the waste heat boiler cools down and the dust is collected by the electrostatic precipitator, the flue gas is sent to make acid. The slag type of high zinc slag is ZnO-FeO-SiO 2 Type, ZnO-FeO-SiO 2 -CaO type, ZnO-FeO-SiO 2 -CaO-ZnO type. The oxygen concentration in the oxygen-enriched air is 60%, and the melting temperature in the melting zone of the Bref furnace is 1300°C.

[0054] The above-mentioned high-grade zinc slag enters the electrothermal reduction zone of the Bref furnace t...

Embodiment 2

[0056] The difference from Example 1 is that the melting temperature in the electrothermal reduction zone of the Bref furnace is 1300°C.

Embodiment 3

[0058] The difference from Example 1 is that the smelting temperature in the electrothermal reduction zone of the Bref furnace is first 1300°C and then 1400°C. Flue gas, slag and pig iron are obtained from the electrothermal reduction zone of the Bref furnace.

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Abstract

The invention provides a pyrogenic process zinc smelting system. The pyrogenic process zinc smelting system comprises a smelting-reducing volatilization furnace, a condensing unit and a first smoke purification unit, the smelting-reducing volatilization furnace comprises a furnace body, a partition wall and at least one heating electrode, the furnace body is provided with an inner cavity, the partition wall is arranged in the inner cavity, the partition wall divides the inner cavity into a smelting area and an electric heating reducing area in the horizontal direction, a communication channelis arranged below the partition wall and is used for communicating the smelting area and the electric heating reducing area, the smelting area is provided with a first feeding opening and a smelting area flue, the electric heating reducing area is provided with a second feeding opening, at least one electrode through hole and an electric heating reducing area flue, the second feeding opening is used for adding of a reducing agent, the heating electrode and the electrode through hole are in one-to-one corresponding, the heating electrode extends into the electric heating reducing area through the electrode through hole, the condensing unit is provided with a zinc steam inlet, the zinc steam inlet is connected with the electric heating reducing area flue, and the first smoke purification unit is connected with the condensing unit. The system is used for pyrogenic process zinc smelting, and the advantages of being simple in flow, low in energy consumption and high in zinc recycling rate are achieved.

Description

technical field [0001] The invention relates to pyro-method zinc smelting, in particular to a pyro-method zinc smelting system. Background technique [0002] Zinc is one of the top ten non-ferrous metals and is widely used in all aspects of the national economy. At present, zinc smelting is mainly based on wet process. Zinc concentrate is leached after roasting or other means to obtain zinc sulfate solution, which is purified and electrolytically deposited to obtain cathode zinc flakes, and zinc casting to obtain Zn99.995 zinc ingots. This process has many steps, complex process, huge investment, and high energy consumption. The DC power consumption per ton of zinc in a single electrowinning process reaches 3000kWh. The most important thing is that the wet process produces a large amount of leaching slag, iron slag, etc., and its output rate exceeds 50%. These slags are hazardous wastes that need to be treated harmlessly, causing a large amount of energy consumption and bri...

Claims

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Application Information

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IPC IPC(8): C22B19/04
CPCC22B19/04Y02P10/20
Inventor 李东波黎敏邓兆磊尉克俭茹洪顺曹珂菲苟海鹏裴忠冶吴卫国许良冯双杰李兵
Owner CHINA ENFI ENGINEERING CORPORATION
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